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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.27: Poster

Dienstag, 27. Februar 2024, 16:30–18:30, ELP 6: Foyer

Influence of the presence of hydrogen isotopes on damage evolution in tungsten — •Zeqing Shen, Thomas Schwarz-Selinger, Mikhail Zibrov, and Armin Manhard — Max-Planck-Institut für Plasmaphysik, Boltzmannstrasse 2, Garching D-85748, Germany

The influence of the presence of deuterium (D) on damage evolution at elevated temperatures was studied for self-ion irradiated tungsten (W). W samples were irradiated by 20 MeV W ions at room temperature to the peak damage dose of 0.23 dpa and loaded with a low-temperature D plasma at 370 K to decorate the created defects. To study the evolution of the defects with D being present, samples were heated during plasma loading to 4 different temperatures, ranging from 470 K to 770 K. The annealing time was calculated by the rate equation modelling code TESSIM-X. For comparison, annealing experiments at each temperature were carried out also in vacuum. After annealing, all samples were re-exposed to the same D plasma as before to decorate the surviving defects. The duration was calculated again by TESSIM-X. At various steps of the experiment, nuclear reaction analysis (NRA) was used to determine the deuterium depth profile. After the last re-exposure thermal desorption spectroscopy (TDS) was used to measure the total amount of deuterium and de-trapping energy of D. The final results will give a quantitative understanding of the influence of the presence of hydrogen isotopes on defect evolution at elevated temperature.

Keywords: Deuterium retention; Annealing; Displacement damage